Midea MGA-D10/N1 Manual page 41

Troubleshooting
P2: Low pressure protection
LED indicates P2
Low pressure protection
Judge 1: The wiring between the low pressure switch
and main control board is connected well or correctly
Judge 2: Whether the low pressure switch is broken
Validate: Short connect the low pressure switch
socket, check whether the system can run normally
Check whether the refrigerant system is ok
Judge 3: Check whether the outdoor ambient
temperature is too low
Judge 4: The refrigerant of the system is leakage
Validate: Connect the pressure gauge to the gauge
joint of the system, check whether the pressure is
lower than 0.15MPa
Judge 5: The refrigerant pipe is blocked
Replace outdoor main board
40
Yes
No
No
No
No
No
Connect it well
Yes
Replace low pressure switch
Leak hunting: charge nitrogen or refrigerant to
the system, if the leakage is serious, there will
Yes
be distinct gas leakage "cici" sound; if the
leakage is little, use the suds(mixture of water
and abluent is also ok, if it can make bubble)
or electronic leak detector.
Yes
Drop refrigerant, then use the high pressure
nitrogen or refrigerant to blow pipe,
vacuumize and add the refrigerant again
MCAC-UTSM-2008-11
Outdoor Unit